Will Saletan writes about politics, science, technology, and other stuff for Slate. He’s the author of Bearing Right.

That paradox suggests a way to dial down the war. Israel says its immediate mission is to destroy the tunnels. It wants to preserve that mission in any cease-fire. Hamas rejects that demand, insisting that the IDF leave Gaza. But Gaza, more so than any other place on Earth, is arguably two territories: one on the surface, one below ground. That difference in elevation separates the terrorists from the civilians more effectively than any line on a map.

To stop the killing in Gaza and the rocket fire on Israel, we need a way to isolate Hamas from its Palestinian hostages. For three weeks, we’ve seen how horribly difficult it is to do that on an urban grid. Maybe it’s time to consider a different dimension.

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Hamas began digging tunnels about 25 years ago. Through tunnels from Egypt, it smuggles in goods and weapons. Below Gaza’s urban centers, it stores rockets and bombs, operates hidden launchers, and shields its commanders from Israeli fire. Through tunnels to Israel, most recently on Monday, it stages kidnappings and militaryattacks.

Gaza, more so than any other place on Earth, is arguably two territories: one on the surface, one below ground.

Lower Gaza, like Upper Gaza, can be divided into regions. The tunnels that alarm Israel most are the ones that burrow into its territory. These start near the Israeli border, not in the middle of Gaza. From east to west, Gaza’s width ranges from three to six miles. So far, the longest tunnel to Israel that’s been found extends one mile.

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These factors raise an intriguing possibility: Could the tunnels to Israel be destroyed without going deeper into Gaza, and without killing civilians?

You can’t do that from the air. That’s one clear lesson from the early days of this war. But now that Israeli troops are in Gaza, it’s easier to target the Hamas netherworld. The IDF claims to have located more than 30 tunnels and destroyed about one-half of them. There might be another 30 or so left to find.

The tunnel hunt allows the IDF to target Hamas while sparing Palestinians. From Israel’s standpoint, that’s ideal. It’s even better when combined with a cease-fire. “There is no reason to prevent Gaza’s people from stocking up on supplies, so long as the military can continue its work against the tunnels,” an Israeli official explains. In fact, when both sides are shooting, “work on destroying the tunnels slows down.” Therefore, one motive for Israel’s pursuit of cease-fires is, in the words of another official, “to allow the pace of destruction of tunnels to increase.”

Some proponents of the tunnel hunt argue that the peripheral locations of the tunnels make deeper incursions into Gaza unnecessary. “This operation is very limited geographically,” says a former Israeli national security adviser. “Most of the operation will not take place in crowded areas with a lot of population, but areas used for agriculture. The land operation, it’s very easy to see where it will be finished. If nothing bad will happen, we will identify the locations of the tunnels, we will blow them up, and we will retreat.”

One possible compromise might be a cease-fire that forbids further IDF movement in Upper Gaza but allows the IDF to continue demolishing Lower Gaza. No more tunnel hunting on the surface, but you can finish imploding the bunkers and passages you’ve already found. Both armies would object, but civilians on each side would be protected. If Hamas refused the deal, the IDF would keep moving through Upper Gaza to hit Lower Gaza. Israel would have to be held accountable, to make sure it respects the distinction and pulls out expeditiously.

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"Weakening Hamas" isn't sufficient. There cannot be any more rounds of rocket fire and response. The strip has to be demilitarized. More...

In the longer term, each side needs more. Gazans need reconstruction aid, open borders, and autonomy. Israelis need an end to rocket attacks. All of these goals could be served by destroying the tunnels and weakening Hamas. It was the discovery of an attack tunnel that drove Israel to tighten its blockade on Gaza last fall. Cripple the threat from below, and Israel might loosen its grip. That outcome could be written into a truce agreement and enforced by arm-twisting from the United States.

For eight years, Lower Gaza has held Upper Gaza hostage. It’s time to end the ordeal.